Production of sebacic acid dinitrile



l atentcd Oct. 2%, Elli-3 1.

PATENT OFFICE I FRITZ .UILCKE, OF BEELIh-ADLl-RSHOF, GERMANY, ASSIGNOR T SCHERING-KAHL- BAUIJE A. G., 015 BERLIN, GERMANY PRODUCTION OF SEBACIC ACID DINITRILE No Drawing.

Up till now seoacic acid dinitrile 3 NEC CH CH CH GH CH 1 OH CH CH GEN has been produced by acting on sebacic acid diamide with phosphoric u lride, thionyl chloride or phos horrus wetachloride, but owing to vigour ot the reaction and the diiliculties experienced i mining the matei s could be obtained acid anhvc only small quantit' in each operation.

1 have now found bacie acid dinit l can produce seio 11' I yield and in a much easier more ac. a eous by treating sebacic acid diamide with phosphorus oxychloride, this compound being used in slig excess preferably a solvent free of vmter r instance benzene or toluene, being adoed to the reacting bodies.

Example Z.7.5 kilograms sebacic acid 'diamide are mixed with 6 kilograms phos phorus oxychloride and the mixture is heated some hours in a steam bath under a reflux condenser. The small quantity of phosphorus oxychloride in excess is decomposed in the usual manner, the phosphoric acid is removed, the product of reaction is washed to neutral reaction and is then distilled in vacuo.

Example 2.To 7.5 kilograms sebacic acid diamide is added a mixture of 6 kilograms phosphorus onychloride and 7 kilograms benzene. The mass is heated 8 hours in a bath under the reflux condenser. When the reaction has come to an end, the solution of sebacic acid dinitrile in benzene is separated from the phosphoric acid sludge which has settled down and is washed to neutral reaction, freed from the benzene and dis- Application filed. October 11, 1928, Serial No. 311,981, and in Germany October 14, 1927.

tilled in vacuo, the yield of sebacic acid din trile being L2 kilograms.

V ions changes may be made in the details disclosed in the foregoing specification out departing from the invention or sacthe advantages thereof.

I claim 1. The method of producing sebacic acid dinitrile comprising acting on sebacic acid diamidc with phosphorus oxychloride.

The method of producing sebacic acid ie comprising acting on sebacic acid with phosphorus oxychloride in the 1c a hydrocarbon of the benzene ser of water.

i method of producing sebacic acid ile comprising acting on sebacic acid -de with phosphorus onychloride in the sauce of benzene.

The method of producing sebaeic acid dinitrile comprising heating 6 parts by weight phosphorus oxychloride, which are dissolved in 7 parts by weight benzene with 7.5 parts by weight sebacic acid diamide to eam temperature during about eight hours, t lg the solution of sebacic acid dinitrile in benzene from the phosphoric acid sludge, wash ng the solution with water, removing the solvent and distilling in vacuo.

In. testimony whereoi I ZlfilX my signature.

FRITZ VILCKE. 

